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Ultrastructural Study of Globidian Parasites Infecting the Abomasum of Sheep in Germany
Studier av ultrastrukturen av Globidium-parasitter fra løpen hos sau i Tyskland
Acta Veterinaria Scandinavica volume 20, pages 321–328 (1979)
Abstract
Globidian parasites infecting the abomasum of sheep in Germany were investigated by means of electron microscopy. The frequency of infection was found to be 93 %. The globidian cyst-like bodies contained multinucleate schizonts, developing merozoites or fully developed merozoites. Among the latter there were two different types, namely short and long forms. The process of merozoite formation was described in detail. The giant schizonts were subdivided into multinucleate cell portions of irregular size and shape. Their nuclei were then arranged at the periphery of the cell portions and underwent their last division which was combined with the differentiation of merozoites. The long form merozoites were elongated cylindrical in shape with terminal nucleus. They measured 7.7 μm in length and 1.0 μm in width. The merozoites of the short type were spindle-shaped with a central nucleus. They were 5.0 μm long and 1.0 μm wide. The globidian parasites were located in a parasitophorous vacuole of an intact host cell.
Sammendrag
Globidium-parasitter fra løpen hos sau i Tyskland ble undersøkt ved hjelp av elektronmikroskop. Infeksjonsfrekvensen var 93 %. Globidium-cystelignende dannelser inneholdt multinucleære schizonter, merozoitter under utvikling eller ferdig utviklede merozoitter. Blant de sistnevnte var det to typer, korte og lange former. Utviklingen av merozoitter ble beskrevet i detalj. Kjempeschizonter ble først delt opp i multinucleære celler av uregelmessig størrelse og form. De enkelte kjernene ble deretter arrangert perifert i cellene, og kjernene delte seg tilslutt i to med etterfølgende utdifferensiering av merozoitter. Den lange typen av merozoitter hadde en langstrakt, sylindrisk form med kjernen terminalt. Gellene var 7,7 μm lange og 1,0 μm i diameter. Merozoittene av den korte typen var spindelformet med kjernen sentralt. Lengden var 5,0 μm og diameteren 1,0 μm.
Globidium-parasittene var lokalisert i en „parasitophor vacuole” inne i en levende vertscelle.
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Hilali, M., Scholtyseeck, E. Ultrastructural Study of Globidian Parasites Infecting the Abomasum of Sheep in Germany. Acta Vet Scand 20, 321–328 (1979). https://doi.org/10.1186/BF03546594
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DOI: https://doi.org/10.1186/BF03546594